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The probllem with the identification is stiffled by a medical journal report in Sowerby, J., Colored figures of English Fungi or Mushrooms, showing two different detailed line drawings of mushrooms identified as Agaricus semiglobatus and Agaricus glutinous, identifid in the 1960s by Rolf Singer as Psilocybe semilanceata. The mushrooms at that time in 1803 had been known to cause intoxications after a family of five (one father and four minor children) in 1792 became intoxicated with visuals of stuning geodesiccal patterns and kaleidascopic effects. So the earliest known intoxication from this species was in 1799 in London. And the species was named in the late 1930 as P. semilanceata.

The name means:
Psilocybe (Naked or bald headed) and,
Semilanceata (half-speared of half lanced) from the shape of the pelius.